objc-arc: provide a warning when 'receiver' of a message is 'weak'
in arc mode and opted-in with -Wreceiver-is-weak flag.
// rdar://10225276


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154042 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed